redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

gpio: fix locking open drain IRQ lines 

[ Upstream commit e9bdf7e655 ]

We provided the right semantics on open drain lines being
by definition output but incidentally the irq set up function
would only allow IRQs on lines that were "not output".

Fix the semantics to allow output open drain lines to be used
for IRQs.

Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Russell King <linux@armlinux.org.uk>
Cc: stable@vger.kernel.org # v5.3+
Link: https://lore.kernel.org/r/20200527140758.162280-1-linus.walleij@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Linus Walleij 2020-05-27 16:07:58 +02:00 committed by Greg Kroah-Hartman
parent bba91cdba6
commit b298c314b9
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpio/gpiolib.c
View File

@ -3894,7 +3894,9 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
}
}
if (test_bit(FLAG_IS_OUT, &desc->flags)) {
/* To be valid for IRQ the line needs to be input or open drain */
if (test_bit(FLAG_IS_OUT, &desc->flags) &&
!test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
chip_err(chip,
"%s: tried to flag a GPIO set as output for IRQ\n",
__func__);
@ -3957,7 +3959,12 @@ void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset)
if (!IS_ERR(desc) &&
!WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) {
WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags));
/*
* We must not be output when using IRQ UNLESS we are
* open drain.
*/
WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags) &&
!test_bit(FLAG_OPEN_DRAIN, &desc->flags));
set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
}
}